We have families in 148 countries reading together through Caribu. Caribu is available in all countries where there are Apple and Android App Stores.
There are no international calling fees when using Caribu over WiFi or cellular data networks.
However, if you are out of your home country when using Caribu, we suggest connecting to WiFi. This is because, depending on your cellular service and international phone plan, you could be charged for using cellular data at the out-of-country rate.